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Sanchayan Dutta's user avatar
Sanchayan Dutta's user avatar
Sanchayan Dutta
  • Member for 6 years, 3 months
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44 votes
3 answers
10k views

How does a quantum computer do basic math at the hardware level?

36 votes
1 answer
14k views

How are quantum gates implemented in reality?

36 votes
5 answers
4k views

Introductory material for quantum machine learning

27 votes
2 answers
7k views

Why does the "Phase Kickback" mechanism work in the Quantum phase estimation algorithm?

26 votes
3 answers
6k views

What exactly are anyons and how are they relevant to topological quantum computing?

25 votes
3 answers
3k views

Why do optical quantum computers not have to be kept near absolute zero while superconducting quantum computers do?

22 votes
1 answer
2k views

What is the use of categorical quantum mechanics?

22 votes
2 answers
21k views

Density matrices for pure states and mixed states

19 votes
2 answers
2k views

What is the mathematical justification for the "universality" of the universal set of quantum gates (CNOT, H, Z, X and π/8)?

18 votes
1 answer
3k views

If quantum gates are reversible how can they possibly perform irreversible classical AND and OR operations?

18 votes
3 answers
778 views

What exactly is meant by "noise" in the following context?

15 votes
6 answers
9k views

Is there any online Bloch sphere simulator?

14 votes
2 answers
2k views

Quantum algorithm for linear systems of equations (HHL09): Step 1 - Confusion regarding the usage of phase estimation algorithm

13 votes
1 answer
1k views

How does Fourier sampling actually work (and solve the parity problem)?

12 votes
1 answer
868 views

Embedding classical information into norm of a quantum state

12 votes
4 answers
5k views

How to quickly calculate the custom U3 gate parameters $\theta, \phi$ and $\lambda$ for any unitary?

12 votes
2 answers
1k views

Understanding Google's “Quantum supremacy using a programmable superconducting processor” (Part 1): choice of gate set

11 votes
1 answer
1k views

How is Grover's algorithm used to estimate the mean and median of a set of numbers?

10 votes
2 answers
988 views

Quantum algorithm for linear systems of equations (HHL09): Step 2 - What is $|\Psi_0\rangle$?

10 votes
2 answers
2k views

Quantum algorithm for linear systems of equations (HHL09): Step 2 - Preparation of the initial states $|\Psi_0\rangle$ and $|b\rangle$

10 votes
1 answer
760 views

What is recursive Fourier sampling and how does it prove separations between BQP and NP in the black-box model?

10 votes
3 answers
5k views

What precisely is the quantum extended Church-Turing thesis?

10 votes
1 answer
838 views

Why does representation theory often arise in the context of quantum algorithms for the hidden subgroup problem?

9 votes
1 answer
1k views

Understanding Google's “Quantum supremacy using a programmable superconducting processor” (Part 2): simplifiable and intractable tilings

9 votes
1 answer
589 views

Is it possible to speed up the generation of the weighting matrix using a quantum algorithm?

8 votes
1 answer
2k views

How exactly does Simon's algorithm solve the Simon's problem?

8 votes
1 answer
887 views

Quantum algorithm for linear systems of equations (HHL09): Step 1 - Number of qubits needed

8 votes
2 answers
2k views

What are theta, phi and lambda in cu1(theta, ctl, tgt) and cu3(theta, phi, lam, ctl, tgt)? What are the rotation matrices being used?

8 votes
1 answer
661 views

SWAP gate(s) in the $R(\lambda^{-1})$ step of the HHL circuit for $4\times 4$ systems

8 votes
2 answers
441 views

Resources for Quantum Communication Complexity